How should I clean the buckle strap?
Place the buckle in a cup of warm water and gently agitate it, pressing the red button several times while in the water. Do not submerge the buckle strap, and do not use soaps, household detergents, or lubricants. Shake out excess water and allow it to air dry until it fastens with a click.
From the official Graco Tranzitions Car Seat manual, page 85
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